System for remote testing of telephone subscribers&#39; lines



C. R. DAVIES Nov. 10, 1979 SYSTEM FOR REMOTE TESTING OF TELEPHONE SUBSCRIBERS LINES Original Filed May 2'7. 1965 20 Sheets-Sheet 2 a DI W SX W: WV X v C 7 MM DIVA S 6 I I I W L T II]! n S nfl 5 u EZSZMHIIIIII. KW m U/ v Cl Hv DI/\ DIS T L D R K R w 5 w WWI] D|\|| L L.. C C K 5 S 4 5 6 PA m m 6 w T I 5 T m a D l l I N: w c) E T P R A mmU R E QV T ET N AEUG E TIC VR D EC [IE/L M I R l I D 5 W 5 w l WW I MW I A/ M m w mflm m6 W T MR% P E K F IL EIL LS M w w I 5 m I6 oiv M B 52 H F 3526 20 Sheets-Sheet 3 C. R. DAVIES NEAR END TEST TRUNK CIRCUIT Nov. 19, 1970 SYSTEM FOR REMOTE TESTING OF TELEPHONE SUBSCRIBERS LINES Original Filed May 27, 1965 02m m m2 o. S

6 O 2 g E Q m m mow mmE3w H 386 :2 5 w R m m H mm 9 M w m H m B M d D T. 2 2 2 2 L F S mokflwmmmm moou u2m5QmEE 52 J i m m: I 4 2 8 C C B B M m T D M H DA 5 HA m Dv P Dv w Y W Wm m m, mm 1 wm n um An/u L I 9F! 28/ W 0 W T @mm A n L T T u Trm Dn Nov. 10, 1970 FIG. 4 FAR END TEST TRUNK CIRCUIT C. R. DAVIES SYSTEM FOR REMOTE TESTING OF TELEPHONE SUBSCRIBERS LINES Original Filed May 27. 1965 20 Sheets-Sheet 4.

JJODHID LS3]. CINE! HVzl 01 3NII EDI/W39 80:1 1830038 DNIWODNI Nov. 10, 1970 c. R. DAVIES 3,539,877

SYSTEM FOR REMOTE TESTING OF TELEPHONE SUBSCRIBERS LINES Original Filed May 27, 1965 20 Sheets-Sheet 7 FIG. 7 LOCKOUT SELECTOR SELECTOR CCT. NO.I

LO-I Rt! SELECTOR CCT. NO. 2

SELECTOR CCT. N0 11 FIG. 8 0 TM 5L. TIMER {7} SE2 4|3 421 sT-n' 4|5 TIMII W W Nov. 10, 1970 c. R. DAVIES 3,539,877

SYSTEM FOR REMOTE TESTING OF TELEPHONE SUBSCRIBERS LINES Original Filed May 27, 1965. 20 Sheets-Sheet 8 MULTIFREQUENCY CODE GENERATOR (NOT UED) 45,2

.ISTZQ 925 1); 455 46 7 \RL-Q ammo g 460 ST -b RL-b a T Q9 457 J 1\. f

462 cuzoso 45' li 453? 9 TM a cougsok) 456 NW0 m, 1% c. R. pAviEs SYSTEM FOR REMOTE TESTING OF TELEPHONE SUBSCRIBERS' LINES Original Filed May 27, 1965 20 Sheets-Sheet 9 FIG. /0

lOl7 CYCLE RECEIVER T0 FM 'DETECTOR c. R. DAVIES SYSTEM FOR REMOTE TESTING OF TELEPHONE SUBSCRIBERS LINES 20 Sheets-Sheet 10 Original Filed May 27, 1965 MULTIFREQUENCY RECEIVER FIG. FI(A3.|6

' DETECTOR? 624 6IO A0 CHANNEL 600' l E- SEPARATION T 8 6H 625 Al FILTERS LIMI ER 697w O- 612 A2 -|0o0 {g A 770- -T} N CHANNEL @1 L T v w 6OI AMPLIFIERS 607 852 ,6I4 628 A4 941 MW P GT 641 '7 640 To 32 GATE 638 'oR GATE AUDIO j 1) GEN. GATE (Elem (FIGS) J6|5 629 50 I048 '-K1\U (SIG 630 5 PREAMPLIFIER |2O9- F' I000- ,elT 63| B2 [800% B 1336' A. B

To HYBRID 30o,

FIG. 3 602 OR GATE 639V 620 634 E0 |95o-. Q}

am 635 2o50- w g-- I320 C 622 636 C2 2T50- KT T603 606 l 623 637 C3 ov. TO,

c. R. DAVIES 3,539,877

SYSTEM FOR REMOTE TESTING OF TELEPHONE SUBSCRIBERS' LINES Original Filed May 27, 1965 20 Sheets-Sheet 11 ,3A TEST RELAY REGISTER OPERATE RELAYS RELEASE RELAYS LP D m 0'5 ms T5? 90 5 270 5 F FR 946 GOVR 0 A2 MA MA MAR MA 90 6OVR 60V 9 MDF MDF'R IN INR 48 VRR B4 VRR VR 9'3 GRG C. R. DAVIES Nov. 30, 1970 SYSTEM FOR REMOTE TESTING OF TELEPHONE SUBSCRIBERS LINES Original Filed May 27, 1965 20 Sheets-Sheet 14.

3970 c. R. DAVIES 3,539,877

SYSTEM FOR REMOTE TESTING OF TELEPHONE SUBSCRIBERS LINES Original Filed May 27, 1965 20 Sheets-Sheet l6 FIG. /5

MULTIFREQUENCY RREAMPLIFIER CHANNEL SEPARATION FILTERS" (FIGIE) FIG. /6 CHAN EL AMPLIF IER, LIMITEB AND DETECTOR DET.

L|M. 7 2Q WV *K Q TO I2 727 726 QLHANNEL SEPARATION RECEIJWN FILTER RELAY- 722 0 TO OTHER DETECTORS DETECTOR BIAS SUPPLY w. w, 1970 c. R. DAVIES 3,539,877

SYSTEM FOR REMOTE TESTING OF TELEPHONE SUBSCRIBERS LINES Original Filed May 27, 1965 20 Sheets-Sheet 1'7 FIG. /7 GATE GENERATOR TO GATE 754 g? 638 k To AUDIO 329 GATE 308(FIGJ TO GATE I 639 (FIG. I2)

FIG. /8 SUPERVlSORY OSCI LLATOR LINE AMP 31o (FIGS) Nov. 10, W70 c. R. DAVIES 3,539,877

SYSTEM FOR REMOTE TESTING OF TELEPHONE SUBSCRIBERS LINES Original Filed May 27, 1965 20 Sheets-Sheet 18 OT F l6. l9 DIAL TONE DETECTOR g g 5 I so 852 855W 257 i p A 850 am so 854 i i i i i 2 A1 E 856 DT 857 MDT 853 END-OF-DIAUNG DETECTOR CONTACTS ON REPERTORY a7e,

DIALER 676 Nov. w, mm c. R. DAVIES 3,539,877

SYSTEM FOR REMOTE TESTING OF TELEPHONE SUBSCRIBERS' LINES Original Filed May 27, 1965 20 Sheets-Sheet 19 TO AUDIO GATE 30a (FIGS) TMJ FROM FIG MA INVERTER FIG 2/ VARIABLE 

